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# If...Then...Else Statement

Defines one or more statement blocks that you only want to execute if a given condition or expression is True.

### Syntax:

      If condition Then
          statements
      [{ElseIf} condition Then
          statements]
      [Else
          statements]
      {EndIf|End If}

Instead of End If you can write EndIf.

If statements can be shortened to one line when using single statement blocks.

      If condition Then statement [Else statement]

### Parameters:

The If...Then statement executes program blocks depending on given conditions. When LibreOffice Basic encounters an If statement, the condition is tested. If the condition is True, all subsequent statements up to the next Else or ElseIf statement are executed. If the condition is False, and an ElseIf statement follows, LibreOffice Basic tests the next expression and executes the following statements if the condition is True. If False, the program continues either with the next ElseIf or Else statement. Statements following Else are executed only if none of the previously tested conditions were True. After all conditions are evaluated, and the corresponding statements executed, the program continues with the statement following EndIf.

Oni povas ingi plurajn ordonojn If...Then.

Ordonoj Else kaj ElseIf estas nedevigaj.

Oni povas uzi ordonojn GoTo kaj GoSub por salti el If...Then bloko, sed ne por salti en strukturon If...Then.

### Example:

La jena ekzemplo ebligas al uzanto entajpi la finiĝan daton de produkto, kaj komputas ĉu la finiĝa dato jam pasis.

    Sub ExampleIfThenDate
        Dim sInput As String
        Dim dInput As Date

      On Error Goto inputError
        sInput = InputBox("Enter the expiration date (YYYY-MM-DD)")
        dInput = DateValue(sInput)

        If dInput < Date() Then
            MsgBox "La finiĝa dato jam pasis"
        ElseIf dInput > Date() Then
            MsgBox "La finiĝa dato ankoraŭ ne pasis"
        Else
            MsgBox "La finiĝa dato estas hodiaŭ"
        End If

    inputError:
        If dInput = 0 Then MsgBox "Invalid input"
    End Sub

Rilataj temoj

Select Case statement

Iif or Switch functions